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Structured Data & JSON-LD Validator
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The Structured Data & JSON-LD Validator checks your Schema.org markup for common problems: missing @context or @type declarations, invalid JSON syntax, and properties that don't match the expected schema type. Even a single missing comma or mismatched property name can cause search engines to silently ignore an entire structured data block, so validating before you publish saves you from losing out on rich result eligibility without knowing why. This tool is built for developers implementing schema across templates, SEOs verifying markup after a site migration, and anyone troubleshooting why a rich result isn't showing up in Google despite adding JSON-LD. Paste your script block in and get an instant validation report highlighting exactly what's wrong - all processed locally in your browser, with no signup and no data sent anywhere. Regular validation matters especially after CMS updates or template changes, since automated content injection can easily break otherwise-correct markup. Scroll down to paste your JSON-LD and validate it now.
Features
- Validates JSON syntax for parsing errors
- Checks for required @context and @type properties
- Verifies property names match expected schema.org vocabulary
- Flags missing required fields for common schema types
- Highlights the exact line or property causing an error
- Instant validation with no upload delay
- No signup or server processing required
Why use this structured data & json-ld validator?
- Validates markup instantly as you paste it in
- Fully client-side - your structured data stays private
- Checks against current Schema.org vocabulary standards
- Clear error messages, no debugging expertise required
- Free with unlimited validations
Frequently asked questions
Why would valid JSON still fail schema validation?
JSON syntax being valid doesn't guarantee the schema is correct - you can have syntactically valid JSON that's still missing required @type or property fields for rich results.
What does @context: "https://schema.org" actually do?
It tells parsers which vocabulary to interpret the following properties against, and is required for search engines to recognize the markup as Schema.org data.
Should I use Google's Rich Results Test or a general JSON-LD validator?
Use both - a general validator catches syntax and schema.org compliance issues, while Google's Rich Results Test confirms specific rich result eligibility for your page.
Can duplicate @type declarations break my structured data?
Yes, conflicting or duplicate @type values on the same object can confuse parsers about which schema properties are expected.
Why did my structured data stop working after a CMS update?
Plugin or theme updates can alter how JSON-LD is injected into the page, commonly introducing broken quotes, duplicate blocks, or missing fields.
Does structured data need to match visible page content?
Yes, Google's guidelines require structured data to reflect content actually visible to users on the page - mismatched data can be treated as spam.
How often should I re-validate my structured data?
Re-check after any template, plugin, or CMS change, and periodically audit important pages since automated injections can silently break markup.
From the blog
JSON-LD vs Microdata: Which Format for Schema?
JSON-LD vs Microdata vs RDFa compared honestly — syntax, maintenance cost, and why Google recommends JSON-LD while Microdata remains perfectly valid.
The Complete Guide to Schema.org Structured Data
Structured data tells search engines what your page means. A practical guide to Schema.org vocabulary, JSON-LD syntax, rich results and validation.